MLA

Kissinger, Henry, 1923-2023. Courtis, Kenneth S.. Box 91, folder 3. 2003-2004. https://collections.library.yale.edu/catalog/12479492.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 91, folder 3"])(2003-2004)[Courtis, Kenneth S.]. https://collections.library.yale.edu/catalog/12479492.